如何通过按钮调用谷歌地图？

Question

我正在尝试实现一个应用，当用户点击按钮时，会显示一个地图。我只使用地图作为主要活动制作了另一个应用程序，它运行正常。但是如果我使用相同的代码作为另一个活动，并尝试从按钮调用它，应用程序停止并且不会显示错误。我不确定错误是在地图代码上还是在意图上。

主要活动

package com.br.appmedico.View;


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.br.appmedico.R;


public class MainActivity extends AppCompatActivity {

    Button btProx, btEsp;
    TextView tvAche;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        tvAche = (TextView)findViewById(R.id.tvAche);
        btProx = (Button)findViewById(R.id.btProx);
        btProx.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getBaseContext(), MapsActivity.class);
                startActivity(intent);
            }
        });

        btEsp = (Button)findViewById(R.id.btEsp);
        btEsp.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {

                Intent intent = new Intent(getBaseContext(),EspActivity.class);
                startActivity(intent);
            }
        });



    }



}

地图活动

package com.br.appmedico.View;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.br.appmedico.R;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.maps);
        mapFragment.getMapAsync(this);
    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }
}

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.br.appmedico">

    <!-- verificar conexao -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <!-- permissão para internet -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!-- permissao necessaria para maps v2 -->
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <!--
         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2, but you must specify either coarse or fine
         location permissions for the 'MyLocation' functionality.
    -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:name="android.support.multidex.MultiDexApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".View.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/. 
        -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="AIzaSyBOe32znnSixywmiN0GzOJw8HKhPwUxvrA" />

        <activity
            android:name=".View.NearbyActivity"
            android:label="@string/title_activity_nearby" />
        <activity android:name=".View.EspActivity" />
        <activity android:name=".View.ListActivity" />
        <activity android:name=".View.Consul1Activity"></activity>
    </application>

</manifest>

build.graddle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.br.appmedico"
        minSdkVersion 21
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        // Habilitando MultiDex
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dexOptions {
        javaMaxHeapSize "4g"
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.google.android.gms:play-services:10.2.0'
    compile 'com.android.support:multidex:1.0.0'
    compile 'com.google.firebase:firebase-ads:10.2.0'
    compile 'com.google.code.gson:gson:2.3.1'
    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup.okhttp:okhttp:2.4.0'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:support-v4:23.4.0'
    testCompile 'junit:junit:4.12'
}

Answer 1

我认为您需要将地图活动添加到清单。

Answer 2

我并不是100％确定你要做的事情，但我认为你不需要一个单独的MapActivity Class来完成它。您只需从用户输入或他们选择的首选项中获取String邮政编码，然后使用该字符串在按钮的onClick方法中启动谷歌地图，如下所示：

     String location = "02466"; //Get this from user input or preference

     Uri geoLocation = Uri.parse("geo:0,0?").buildUpon()
             .appendQueryParameter("q",location)
             .build();

     Intent i = new Intent(Intent.ACTION_VIEW);
     i.setData(geoLocation);

     if (i.resolveActivity(getPackageManager())!=null){
         startActivity(i);
     }else{
         Log.v("Main", "An Error Occured");
     }